Support for vacuum tubes



July 7, 1925.

J. O. GARGAN SUPPORT FOR VACUUM TUBES 2 Sheets-Sheet 1 Filed Oct. 17, 1919 I me/zfof John 0 Gargan July 7, 1925.

2 SheetSfiQheet 2 Filed 0011., 17. 1919 Patented July 7, 1925.

UNITED STATES 1,545,247 PATENT OFFICE...

JOHN O. GARGAN, O1 BROOKLYN, NEW YORK, AS'SIGNOR T WESTERN ELECTRIC GOM- PANY. INCORPORATED, OF NEW YORK, N. Y., A CORIPORATION OF NEW YORK.

SUPPORT FOR VACUUM TUBES. 1

Application filed October 17, 1919. Serial No. 331,461.

To all 'wh am it may concern:

Be it known that I, JOHN O. GARGAN, a citizen of the United States, residing at Brooklyn, in the county of Kings, State of New York, have invented certain new and useful Improvements in Supports for Vacuum Tubes, of which the following is a full, clear, concise, and exact description.

This invention relates to supports for vacuum tubes, and more particularly it relates to a support which will absorb substantially all vibrations that would otherwise be 1mparted to the vacuum tube from the structure on which it is mounted.

.In amplifier circuits, particularly of the multi-stage type, wherein a number of vacu-- um tubes are employed, it has been found that very minute vibrations of the electrodes of the first tubes produce variations in their output current which, when re-amplified by the succeeding tubes, are of such magnitude as to seriously interfere, with. if not renderimpossible, the proper reception of the signals.

In order to prevent these vibrations it has been hitherto suggested that the tubes be mounted on. a flexible support, such as sponge rubber. Such an arran ement is dei scribed and claimed in United tates Patent 1,401,121, issued December 27, 1921 to R. M. Allen and entitled Mounting for vacuum tubes. This invention constitutes an improvement of this arrangement and provides a mounting for a vacuum tube on a flexible support of such a character that the vacuum tube electrodes are in close proximity to i the axis passing through the points of support and about which axis the tube moves when subjected to vibrations. This placing of the electrodes near the flexible support diminishes'to a considerable degree the eifect of any vibrations which for other mounta 'in'gs might pass through the flexible support to such an extent as to be objectionable.

In the 'specific aspect of this invention hereinafter described in detail, the mounting comprises a base plate which is fastened to a fiexible'su port by means of yoke members.

The tube is mounted 'on the base plate so that the tube projects back in the general -direction of the flexiblesupport, and if de-.

sired the tube may extend'tofla'nd slightly beyond the support. With; such an arrangement the=eleetrodes of the tube are in close proximity to the centeriof motion of the system, thereby minimizing the movement of the electrodes when the tube is subjected to vibration. The overlapping relation of the yoke members and the tube makes the overall depth of the apparatus much less than in the ordinary case where the tube is mounted on that side of the base plate opposite the flexible support.

This invention will be better understood by reference to the following detailed description taken in connection with the accompanying drawings, in which Fig. 1 represents a view in plan of a box containing a plurality of vacuum tube sockets which are mounted in accordance with this invention;

.Fig. 2 is a cross-sectional view of Fig. 1, taken on the line 22 of Fig. 1; and Fig. 3

minals of the vacuum tubes, thereby connecting the electrodes of the tubes to such electrical apparatus as. may be connected to the other ends of these springs 12. The base plate 4 is supported near one end by a yoke member 15 which is suitably fastened to a layer of yielding material 16 which, for example, may be of sponge rubber. This layer 16 by means of angle pieces 17 and 18 is fastened; to a supporting framework 19 which in turn is secured to the box 3. The base plate 4 near its other end is supported by a yoke member (not shown) similar to member 15 and which is fastened to another layer 23 of yielding material. This layer 23 is fastened to the framework 19 in a a'lengtht at the tubes held by the sockets project slightly beyond thesup orts 16 and 23. This arrangement brings t e electrodes structure may be given additional weight by fastening additional apparatus, such as retardation coils 25 to the-yoke members 15. I

In the drawing two retard coils are shown mounted on each vertical arm ofthe two yoke members. This increase in welght of the supporting structure of the tubes will serve to increase the inertia and lower the natural period of the support, thereby making the structure still more vibration-proof.

. be connected in circuit with one or more of The manner in which the retard coils may the vacuum tubes of the set is shown in Fig. 3 where the eight retard coils 25 are inserted in the leads of a generator 30'which supplies voltage between the anode 31 and cathode 32 of tube 9. Tube 9 is associated with an inductance 33 and capacity 34 in such a manner that the tube may be employed as a generator for supplying electrical oscillations to the output terminals 35. The retard coils 25 serve to prevent generator 30 from being appreciably. afi'ected by the oscillations set up in tube 9.

It is to be understood that the layers of elastic material 16 and 23 may be mounted in any suitable plane, horizontally, vertically, or otherwise. In case however, the material is mounted in a vertical plane it may be preferable to employ for the elastic material some form of rubber denser than sponge rubber.

It is obvious that the supporting structure above described may be considerably modified without departing i n anywise from the 'spirit of this invention as defined in the appended claims.

What is,claime.d is:

1. A vacuum tube support comprlsing a layer of yielding material, a rigid member attached to but spaced from said material, and means for securing a vacuum tube to said member, said tube projecting from said member toward said material.

2.' A vacuum tube support comprising a cushion, a frame supported by said CllSlllOll,

and means on said frame for suppxorting a vacuum tube with the electrodes t ereof in closer proximity base of the tube. v

3. A vacuum tube support comprising a frame, a shock absorbing means carried by .said frame, a second frame mounted on said shock absorbing means, and means on said second frame to reoeivea vacuum tube and to the cushion than is the position it with the electrodes thereof substantially at the center of motion of said second frame.

4. A vacuum tube support comprising a cushion, a yoke member fastened to andprojecting from said cushion, and means for securing a vacuum tube to said yoke, said tube projecting toward said cushion.

5. A vacuum tubesupport comprising a cushion, a yoke member fastened to said CHSlllOIl, a base plate supported by said yoke,

a vacuum tube socket on said base plate, said socket bemg disposed on said base plate so as to project the vacuum tube held there: by toward said cushion.-

6. A vacuum tube support comprising a layer of yieldingv material, a second layer of yielding material, a yoke member proj ecting from each of said layers, a base plate supported by said yoke members, and a plurality of vacuum tube sockets mounted on the side of said plate adjacent to said layers.

7. A vacuum tube support comprising a layer of yielding'material, a second layer of yielding material, a yoke member fastened to and projecting from each of said layers, a vacuumtube socket supported by said yoke member, a plurality of impedance elements mounted on said yoke member to add inertia thereto, and electrical. connections between said impedance elements and said vacuum tube socket.

8. A vacuum tube support comprising a cushion, a second cushion, a yoke member fastened to and projecting from each of said cushions, a vacuum tube socket supported from said yoke member to position a vacuum tube between said cushions, a plurality of inductances mounted on said yoke member to add inertia thereto, and electrical connections between said inductances and said vacuum tube socket.

9. An electric system comprising a vacuum tube, a resilient support therefor comprising shock absorbing material and a yoke member supported by said material,

an inductance element supported by said yoke to add inertia thereto, and an electrical connection between saidinductance and an electrode of said tube.

10. A vacuum tube support comprising brackets,'a strip of yielding material extending between and supported by said brackets,

a rigid member supported by said strip and a vacuum tube supporting means supported by said rigid member and arranged between said member and said strip.-

In witness whereof, I hereunto'subsc'ribe my name this 10th day of October'A. D., 1919.

JOHN O. GARGAN. 

